DOUGLAS T SUMMERFIELD MD
NPI 1518120633
Internal Medicine - Critical Care Medicine in Mason City, IA
About Douglas T Summerfield Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DOUGLAS T SUMMERFIELD MD (NPI 1518120633) is an individual critical care medicine provider in Mason City, Iowa, licensed in Iowa (41014) and active in the NPI registry since July 2008. He is enrolled in Medicare PECOS, is affiliated with Mercyone North Iowa Medical Center, and is a graduate of Creighton University School Of Medicine (2007).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 13
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Douglas T Summerfield Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Douglas Summerfield reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Mason City, IA 50401
- Reassigned Medicare billing, Iowa enrollment
- 420 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercyone North Iowa Medical Center
Acute Care Hospitals · Mason City, IAFranklin General Hospital
Critical Access Hospitals · Hampton, IAMitchell County Regional Health
Critical Access Hospitals · Osage, IAFloyd County Medical Center
Critical Access Hospitals · Charles City, IAKossuth Regional Health Center
Critical Access Hospitals · Algona, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 50401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MASON CITY, IA 50401
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Douglas Summerfield's NPI number?
The NPI number for Douglas Summerfield is 1518120633. It was assigned to this individual provider in the NPPES registry on July 9, 2008.
Where is Douglas Summerfield located?
Douglas Summerfield practices at 1000 4th St SW, Mason City, IA 50401. The listed phone number is (641) 428-6999.
What is Douglas Summerfield's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Douglas Summerfield enrolled in Medicare?
Yes. Douglas Summerfield is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Douglas Summerfield's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Douglas Summerfield reassigns Medicare benefits to North Iowa Mercy Clinics (Mason City, IA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Douglas Summerfield's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Douglas Summerfield accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and Oscar Health and 2 other insurers list Douglas Summerfield as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Douglas Summerfield affiliated with any hospitals?
According to CMS data, Douglas Summerfield is affiliated with Mercyone North Iowa Medical Center, Franklin General Hospital, Mitchell County Regional Health, Floyd County Medical Center and Kossuth Regional Health Center.
When was this NPI record last updated?
The NPPES record for Douglas Summerfield was last updated on May 30, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Douglas T Summerfield, MD · NPI 1518120633
Critical Care Medicine physician in Mason City, Iowa. Individual provider, active in the CMS NPPES registry since July 9, 2008.
## Identity
- **NPI:** 1518120633 (Entity type: Individual)
- **Enumerated:** July 9, 2008
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 41014 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 1000 4TH ST SW, Mason City, IA 50401-2800
- **Phone:** (641) 428-6999 · **Fax:** (641) 428-6678
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** North Iowa Mercy Clinics (NPI 1043321102, Mason City, IA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Creighton University School Of Medicine, class of 2007
## Record status
- **NPPES last updated:** May 30, 2023
- **Other identifiers:** Other 408284 (VA); Medicaid 5915367 (NC); Other PAR (VA); and 10 more
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Source: [NPI Profile](https://npiprofile.com/npi/1518120633) · Data from the CMS NPPES public registry.